1:

$code = preg_replace('!<if\((.*)\)>!sieU', '"\".((".$this->stripSlashes(\'\\1\').") "', $code);

1:

$code = preg_replace('!<expression>(.*)</expression>!sieU', '"\".".$this->stripSlashes(\'\\1\').".\""', $code);

1:

$code = preg_replace_callback('!<if\((.*)\)>!siU', function($matches) { return $this->stripSlashes($matches[1]);}, $code);

1:

$code = preg_replace_callback('!<expression>(.*)</expression>!siU', function($matches) { return $this->stripSlashes($matches[1]);}, $code);